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Now showing items 1-10 of 69

#### General existence principles for nonlocal boundary value problems withφ-laplacian and their applications

(Hindawi Limited, 2006-01-01)

#### On constant-sign periodic solutions in modelling the spread of interdependent epidemics

(Cambridge University Press (CUP), 2006-01-01)

We consider the following model that describes the spread of n types of epidemics which are interdependent on each other:
u(i)(t) = integral(t)(t-r) g(i)(t, s) f(i) (s, u(1)(s), u(2)(s),..., u(n)(s))ds, t is an element of ...

#### Positive solvability of systems of nonlinear hammerstein integral equations

(Elsevier BV, 2005-11-01)

#### Multiple positive solutions of singular discrete p-laplacian problems via variational methods

(Springer Nature, 2005-01-01)

We obtain multiple positive solutions of singular discrete p-Laplacian problems using variational methods.

#### Construction of upper and lower solutions for singular discrete initial and boundary value problems via inequality theory

(Springer Nature, 2005-01-01)

We present new existence results for singular discrete initial and boundary value problems. In particular our nonlinearity may be singular in its dependent variable and is allowed to change sign.

#### Solvability of singular second order m-point boundary value problems

(Elsevier BV, 2005-01-01)

#### Twin positive periodic solutions of second order singular differential systems

(Uniwersytet Mikolaja Kopernika/Nicolaus Copernicus University, 2005-06-01)

In this paper, we study positive periodic solutions to singular second order differential systems. It is proved that such a problem has at least two positive periodic solutions. The proof relies on a nonlinear alternative ...

#### Multiplicity of positive periodic solutions to second order differential equations

(Cambridge University Press (CUP), 2006-04-01)

In this paper, we study the existence of positive periodic solutions to the equation x" = f (t, x). It is proved that such a equation has more than one positive periodic solution when the nonlinearity changes sign. ...